WoGE #525 was an interesting challenge which I could not solve before I saw the size of the nearby water body.
This one is tangentially related, you might say, as this is also time-related. But in a very different way.
Yet again, the first person to post the position and whatever is interesting about the geology/hydrology/geowhatever in this location, wins the privilege of hosting the next WoGE.
Previous WoGEs are collected by Felix on his blog and a KML file.